Box Sizing
Utilities for controlling how the browser should calculate an element's total size.
Examples
All examples below have a 128px height and width. You can see how .d-box-border elements includes the padding and border into the overall box's height and width.
<div class="d-box-border">…</div>
<div class="d-box-content">…</div>
<div class="d-box-unset">…</div>